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RISS 인기검색어
- 검색키워드
- 저자 : Yahong Ding (검색결과 3 건)
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Influences of Steel Fiber Content on Size Effect of the Fracture Energy of High-Strength Concrete
Ping Xu,Jinyi Ma,Yahong Ding,Minxia Zhang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.3
Quasi-brittleness is an important factor affecting the size effect of concrete, and the addition of steel fiber can effectively change this effect in concrete. The size effect on the fracture energy of steel fiber reinforced high-strength concrete was investigated in this paper. A total of 156 concrete single-edge notched beams (SENB) of various span-to-depth ratios, crack-to-depth ratios and steel fiber contents were tested to study the size effect of fracture energy of the high-strength concrete added steel fibers. The parameters of fracture in the boundary effect model (BEM) and size effect law (SEL) were deeply analyzed. The results show that the addition of steel fiber will generate significant influence on the parameter values obtained from both BEM and SEL. Based on the BEM, the relationship among Gf (experimental test fracture energy), gf(local fracture energy), and GF (fracture energy unaffected by specimen boundary) could be obtained. Thus, a method for analyzing the influence of steel fiber on GF was proposed using small-size SENB specimens at laboratory. In addition, based on the SEL, the impact of size effect on the fracture energy was effectively mitigated by the addition of steel fibers in high-strength concrete to a certain extent.
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Flexural Behavior of RC Beams with NSM Prestressed Helical Rib Steel Wire
Meixiang Zhang,Xiaolin Yang,Yahong Ding,Ping Xu,Bo Sun,Xiaoyi Zhang,Xianggang Zhang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9
The reinforcement technique of near-surface mounted?NSM?prestressed helical rib steel wire (PHRSW) with wide raw material sources, lower in price and high application value can significantly enhance the flexural behavior of reinforced-concrete (RC) structures. Based on 8 flexural RC beams reinforced with NSM PHRSW, performance of test beams under different groove widths (10 mm, 15 mm and 20 mm) and concrete strengths (C30 and C40) was analyzed, including load-deflection, ductility, flexural capacity, strain of longitudinal steel bar and HRSW, failure mode and crack propagation. The results show that the overall flexural behavior RC beams reinforced with NSM PHRSW was significantly improved. There is a good entirety bearing capacity between the longitudinal reinforcement and PHRSW of reinforced beam with suitable groove size. The comprehensive performance of reinforced beams increases first then decreases, with the increase of groove size. The higher the strength of concrete, the more significant the influence of groove size. There is an optimal match between groove width and concrete strength for RC beams reinforced with NSM PHRSW. Considering comprehensive property of reinforced beams, groove width with 15mmwas best in this research. The results can make the research of RC beams reinforced with NSM PHRSW more comprehensive and in-depth, and provide design basis for its engineering application.
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Effect of activator types on cement mortar with polymeric aluminum chloride waste residue
Ping Xu,Yuhao Cui,Dong Han,Minxia Zhang,Yahong Ding Techno-Press 2023 Advances in concrete construction Vol.15 No.3
Water glass (WG) and sodium sulfate (SS) were used to prepare polymeric aluminum chloride residue cement mortar (PACRM) by single and compound blending with polymeric aluminum chloride waste residue, respectively. The structural strength and textural characteristics examinations showed that PACRM consistency increased by incorporating WG, but decreased by incorporating SS. When WG and SS were compounded, the mortar consistency initially rose before falling. The compressive strength of PACRM increased and then decreased as WG was increased. The mechanical properties of PACRM were better enhanced by SS than WG, showing no strength deterioration. The main reason for the improved mechanical properties of polymeric aluminum chloride waste residue in the presence of activators is the increased precipitation of reactive substances, such as C-S-H gels, calcium silica, and Ca(OH)<sub>2</sub>. The density of the specimens with PACRM and the degree of aggregation of hydration products were significantly enhanced by generating more hydration products in the mortar. Further, the cracks and pores were significantly reduced, and the matrix structure was continuous and dense at 5% SS doping and 3% compound doping.
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